Zhao Kui, Ding Zicheng, Xue Longjian, Han Yanchun
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Graduate University of the Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, People's Republic of China.
Macromol Rapid Commun. 2010 Mar 16;31(6):532-8. doi: 10.1002/marc.200900770. Epub 2010 Jan 5.
Crystallization-induced vertical stratified structures were constructed based on double-crystalline poly(3-hexylthiophene) (P3HT)/poly(ethylene glycol)s (PEG) systems at room temperature, in which the P3HT crystallinity and the mechanism were investigated. Vertical stratified microstructures with highly crystalline P3HT network on the surface were formed when depositing from marginal solvents, while lateral phase-separated structures or low P3HT crystallinity were observed for good solvents. The morphological differences came from the solvent effect. In marginal solvents, p-xylene and dichloromethane, P3HT large-scale microcrystallites were generated in solution, which ensured the priority of P3HT crystalline sequence, and phase separation began in the liquid states. When the PEG matrix began to crystallize, great energy from which the second phase separation was induced drove P3HT crystallites to the surface, resulting in the formation of vertical stratified microstructures with highly crystalline P3HT network on the surface. The method, crystallization-induced phase segregation of crystalline-crystalline blends in marginal solvent, provides a facile way to construct vertically stratified structures, in which P3HT highly crystalline network is favored.
基于双晶聚（3-己基噻吩）（P3HT）/聚（乙二醇）（PEG）体系在室温下构建了结晶诱导的垂直分层结构，其中对P3HT的结晶度及其机理进行了研究。当从边缘溶剂中沉积时，会形成表面具有高度结晶P3HT网络的垂直分层微结构，而对于良溶剂，则观察到横向相分离结构或低P3HT结晶度。形态上的差异源于溶剂效应。在边缘溶剂对二甲苯和二氯甲烷中，P3HT在溶液中生成大规模微晶，这确保了P3HT结晶序列的优先性，并且相分离在液态时开始。当PEG基质开始结晶时，诱导二次相分离的巨大能量驱使P3HT微晶到达表面，从而形成表面具有高度结晶P3HT网络的垂直分层微结构。这种在边缘溶剂中结晶诱导结晶-结晶共混物相分离的方法，提供了一种构建垂直分层结构的简便方法，其中P3HT高度结晶网络受到青睐。
